Hidden within Kyoto is the "mirror capital" where youkai and humans live together and no one ever dies. It is protected by three people - Kurama, Yase, and Myoue - as they await the return of their parents, Myoue Jonin and Koto. One day a young girl named Koto (same name, different spelling) and her little brothers A and Un wander into the city from a different dimension looking for her mother. A mecha-geek with red eyes, it's not immediately clear whether she's human or youkai. Her arrival upsets the long peace that had ruled the city.
A Family's Circumstances and Its Background
What Came Was a Little Sister
The Eldest and His Happy Science Team
The Second Daughter and Her Wonderful Monsters
The Worries, Beginning, and Ending of the Young Third Son
A Story Where Two Plan and One Worries
Mom's Back, and oh, Dad's Back, Too
A Story of a Fight Between Here and There
Let's All Think About What We Can Do!
A Manga Movie About People Who Have a Fun, Busy Life